Friction-clutch



(No Model.) 2- Sheets-Sheet 1.

M. P. BOSS.

FRIGTION CLUTCH.

N0. 325,388. Patented Sept. l, 1885.

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No. 325,388. Patented Sept. l, 1885.

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UNITED STATEs PATENT trice.

MARTIN P. BOSS, OF OAKLAD, CALIFORNIA.

FRICTION- CLUTCH.

SPECIFICATION forming part of Letters Patent No. 325,388, dated September l, 1885.

Applicatitn filed July l, 1825. [No model.)

To all whom it may concern:

Be it known that I, MARTIN I). Boss, of the city of Oakland, Alameda county, State of California, have invented an Improvement in Friction-Clutches; and I hereby declare the following to loe a full, clear, and exact description of the same.

My invention relates to the class of friction clutches; andv :my invention consists, first, in a ring of a springy nature secured to the part or mechanism to which power is to be trans mitted and operated by frictional mechanism on the driving-shaft, and, secondly, in the novel frictional mechanism and the means for operating it, hereinafter described.

The general objectof my invention is to provide a simple and effective friction-clutch. rlhe particular objects I shall explain in the course of thc following description.

Referring to the accompanying drawings, Figure l is aperspecti've View of my friction clutch, a portion ofthe friction-ring and gear being broken away. Fig. 2 is a vertical section through one-half of the clutch. Fig. 3 is an elevation of the head D and guides E. Fig. fl is a side view of one of the shoes F. Fig. 5 is a view of the yoke G.

rlhough the clutch may be used to drive pulleys, ttc., I here show a gear, A, loose on the driving-shaft B. The gear is formed with a small flange, a, to which is secured by means of pins e the ring ,0. This ring is made of metal, generally castiron, and is of a springy nature, having a suitable diameter and a thinness adapted to this end. The pins c are .not seated tightly in the lange of the gear, but enter holes therein slightly larger in diameter, so that the spring of the ring may not be interfered with, and it may be allowed to accommodate itself to any irregularity in the adjustment of the shoes.

D is ahead having somewhat of an H shape, with a wide cross-har, which is bored out to receive the driving-shaft B, to which the head is fixed by set-screws d. Through the sides of the head longitudinally pass the guides E, consisting of round iron. These are fixed therein in suitable manner, a practical construction being tocast the head around them. rlhe ends of the guides E project beyond the head, and on them are fitted the sh oes I, which are adapted to slide to and from the head. rlhe shoes are provided with a facing, f, the outer surface having the curvature of the ring C, against which they are adapted to bind when forced outwardly.

In the sides of the cross-har of the H -shaped head D are made recesses d', in which the arms g of the yoke G loosely t. The yoke G has a hub, g, which is loosely mounted on the shaft B, and is provided with a peripheral groove, g2, for a loose collar, I. The arms of the yoke tltting in the recesses of the head, the yoke itself 4is caused to rotate with the shaft. Mounted in a bed-timber is a rockshaft, J, actuated by a hand-lever, K. On the shaft are cranks j, from the ends of which extend links j to the collar I on the hub of the yoke. By operating lever K the yoke may be moved longitudinally on the shaft B, its arms being fitted loosely in the head D.

L are toggles or links, one end of which is pivoted in the shoes F on a pin, l, and the other end is pivoted in the ends of the yokearms by pins l. Then the yoke is moved toward the head D, the toggles force the shoes outwardly against the ring C, and when moved back from the head the toggles withdraw the shoes.

The peculiar construction of the toggles is shown in Fig. 2. It consists of the heads m, into one of which an adjusting screw-bolt, m', is let. The head of this bolt abuts against the opposite head, m, and is connected therewith by a swivel-joint formed by a pin, mi, through said head into the head of the bolt, and a cross-pin, at, holding the pin m2 in place. This permits the bolt to he turned to shorten or lengthen the toggles. A jam-nut, mi, fixes the bolt.

The operation of the clutch is as follows: Then the shoes are withdrawn from the ring C, the gear A remains stationary, it being'loose on the shaft. TWhen the clutch is to be thrown in, the lever K is operated to rock shaft J in a direction to force the yoke G toward the head D. The arms of the yoke being pivoted to the lower ends of toggles L, its motion parallel with the shaft is transferred through the toggles into motion at right angles to said shaft, thereby forcing the shoes F outwardly. These, sliding accurately on the guides E, bind.

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against the ring C, through which power is transmitted to the gear. To stop-the gear the operation is reversed.

The object in making the friction-ring C so that it will have a slight spring is not only that it may accommodate itself to an irregular or inaccurate adjustment of the shoes, if such should take place, but also to avoid the necessity of 'such a delicate adjustment as would be required for a stiii` or rigid ring.

The shoes, when forced against a stiff ring, have to be very delicately adjusted, and though binding for a while, may from some cause be relieved slightly, whereupon the ring will slip; but a springy ring, by being forced to a slight elongation, cannot so slip, and the friction will remain perfect. This springy ring I deem of prime importance in a friction-clutch, and I herein claim it, whether used in connection with the friction mechanism described orwith other friction mechanisms, and at the same time claiming the particular friction mechanism,whether used with a ring of aspringy natureor a stiff ring.

I am aware that friction-clutches are known in which shoes are forced outwardly against a friction-surface by means of toggles, and I do not therefore claim such broadly.

Havingr thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In a frictionclutch, the ring C, of a springy nature, secured to the part or mechanism driven and operated by friction mechanism on the part driving, the said friction mechanism bearing directly against the flange of the ring, substantialy as herein described.

2. In abfriction-clutch, the ring O, of a springy nature, rsecured to the part or mechanism driven, in combination with yradiallymoving shoes on the part driving adapted to bind against the ring, substantially as herein described.

3. In a friction-clutch, the ring C, of a springy nature, secured to the part or mechanism driven, and adapted to have a slight movement thereon, said ring being operated by friction mechanism on the part driving, substantially as herein described.

4. In a friction-clutch, the gear A, or other part or mechanism to which power is to be transmitted, havingaiiange, a, in combination with the ring C, of a springy nature, and operated by friction mechanism on the drivingshaft, and the pins c, through the ring and loosely seated in the ange, whereby the ring may have a slightmovement thereon, substantially as herein described.

5. In a friction-clutch, the gear A, or other part or mechanism to which power is to be transmitted, having a flange, a, and the ring C, of a springy nature, secured to the flange a by pins c, loosely seated thereon, as described, in combination with radially-moving shoes on the driving-shaft adapted to bend against the ring, substantially as herein described.

6. In a frictionclutch, the ring C, of a springy nature, secured to the part or mechanism to which power is to be transmitted, in combination with a head on the driving-shaft, guides in the head, shoes on the guides adapted to move radially to bind on the ring, and mechanism for operating the shoes, substantially as herein described. y

7. In a friction-clutch, and in combination with a friction-ring on the part or mechanism to which power is to vbe transmitted,.the head D, iixed onvthe driving-shaft, the-radialguides E, fixed in the head, the shoes F, fitted and sliding on the guides, and mechanism for moving said shoes to force themagainst or .withdraw them from the friction-ring, vsubstantially as herein described.

8. In a friction-clutch, and in combination witha friction-ring onthe part or mechanism to which power is to be transmitted-the head D,xed on the driving-shaft, the radial guides E, fixed in the hea'd, the shoes F,iitted and sliding on the guides, the yoke G, mounted loosely on the driving-shaft and having arms g resting in recesses in the head, the toggles or links L, pivoted to the shoes and lto the arms of the yoke, and mechanism for longitudinally moving the yoke to move the shoes radially to or from the friction-ring, substantially as herein described.

9. In a friction-clutch, and in combination with a friction-ring on the part or mechanism to which power is to be transmitted, the head D,xed on the drivingshaft, the radial guides E, fixed in the head, the shoes F, fitted and sliding on the guidesfthe yoke @amounted loosely on the driving-shaft and having arms g resting in recesses in the head, the toggles or links L, pivoted to the shoes andA to the arms of the yoke, thelcollar I,loosely embracing the hub of the yoke, the rock-'shaft J, and thelinks j', connecting the .cranks `with .the collar, all arranged and adapted to operate substantially as .herein described.

In witness whereof I -have v`hereunto set 4my hand.

MARTIN P. BOSS.

Witnesses:

C. D. COLE, J. H. BLOOD.

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